[linux-lvm] "umount" LVM stuff

[linux-lvm] "umount" LVM stuff

[David Corbin]

I have created a RAID1 drive.  I've created an LVM setup on top of it so 
I can easily repartition it "at will".  However, I need to do something 
to adjust the RAID device, and I cannot because it is "busy".  What is 
the correct way to "unmount" all the LVM stuff so that nothing is 
currently running on top of /dev/md0, without permanently changing any 
of my LVM configuration?

Thanks
David

Re: [linux-lvm] "umount" LVM stuff

[Goetz Bock]

On Sun, Feb 23 '03 at 09:52, David Corbin wrote:
> [ ... ]  What is the correct way to "unmount" all the LVM stuff so
> that nothing is currently running on top of /dev/md0, without
> permanently changing any of my LVM configuration?
What about

vgchange -a n 

not?
-- 
Goetz Bock       (c) 2003 as     blacknet.de - Munich - Germany   /"\
IT Consultant    GNU FDL 1.1    secure mobile Linux everNETting   \ /
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 ASCII Ribbon Campaign against HTML email & microsoft attachments / \

Re: [linux-lvm] "umount" LVM stuff

[David Corbin]

Goetz Bock wrote:

>On Sun, Feb 23 '03 at 09:52, David Corbin wrote:
>  
>
>>[ ... ]  What is the correct way to "unmount" all the LVM stuff so
>>that nothing is currently running on top of /dev/md0, without
>>permanently changing any of my LVM configuration?
>>    
>>
>What about
>
>vgchange -a n 
>
>not?
>  
>
Well, that appears to have solved the immediate probelm.  Now, help me 
get through the next one....

Attempts to access the logical volume I used to fail. 

piano:/etc# ls -ltar /dev/vg0
total 28
crw-r-----    1 root     disk     109,   0 Feb 23 13:35 group
drwxr-xr-x   10 root     root        24576 Feb 23 13:35 ..
dr-xr-xr-x    2 root     root         4096 Feb 23 13:35 .
piano:/etc# ls -ltar /dev/vg0/group
crw-r-----    1 root     disk     109,   0 Feb 23 13:35 /dev/vg0/group
piano:/etc#

I'm concerted that "group" is /dev/vg0, instead of "data".

Ideas on how I can recover this?

David.

Re: [linux-lvm] "umount" LVM stuff

[Goetz Bock]

On Sun, Feb 23 '03 at 13:57, David Corbin wrote:
> Well, that appears to have solved the immediate probelm.  Now, help me 
> get through the next one....
> 
> Attempts to access the logical volume I used to fail. 
You have disabled it, it's gone. 

> piano:/etc# ls -ltar /dev/vg0
> total 28
> crw-r-----    1 root     disk     109,   0 Feb 23 13:35 group
> drwxr-xr-x   10 root     root        24576 Feb 23 13:35 ..
> dr-xr-xr-x    2 root     root         4096 Feb 23 13:35 .
> piano:/etc# ls -ltar /dev/vg0/group
> crw-r-----    1 root     disk     109,   0 Feb 23 13:35 /dev/vg0/group
> piano:/etc#
> 
> I'm concerted that "group" is /dev/vg0, instead of "data".
> 
> Ideas on how I can recover this?
Well, read the LVM faq/howto somewhere at sistina.com, than
read

http://www.tuxedo.org/~esr/faqs/smart-questions.html

and finaly tell us what you attemp to do? you can not unmound an lvm and
the group file is a very essential file for LVM.
-- 
Goetz Bock       (c) 2003 as     blacknet.de - Munich - Germany   /"\
IT Consultant    GNU FDL 1.1    secure mobile Linux everNETting   \ /
                                                                   X
 ASCII Ribbon Campaign against HTML email & microsoft attachments / \

Re: [linux-lvm] "umount" LVM stuff

[Goetz Bock]

On Mon, Feb 24 '03 at 02:15, Goetz Bock wrote:
> > Attempts to access the logical volume I used to fail. 
> You have disabled it, it's gone. 
Don't panik :->

your LVM will reappear, once you enable it again (vgchange -a y)
still, read some docs.
-- 
Goetz Bock       (c) 2003 as     blacknet.de - Munich - Germany   /"\
IT Consultant    GNU FDL 1.1    secure mobile Linux everNETting   \ /
                                                                   X
 ASCII Ribbon Campaign against HTML email & microsoft attachments / \

Re: [linux-lvm] "umount" LVM stuff

[David Corbin]

Goetz Bock wrote:

>On Mon, Feb 24 '03 at 02:15, Goetz Bock wrote:
>  
>
>>>Attempts to access the logical volume I used to fail. 
>>>      
>>>
>>You have disabled it, it's gone. 
>>    
>>
>Don't panik :->
>
>your LVM will reappear, once you enable it again (vgchange -a y)
>still, read some docs.
>  
>

I have read some docs.  I've spent hours combing the Net for the 
answers, without success.

I *had* a working system.  But, I use the LVM commands so rarely, I can 
never repeat what I did (notes or not).

piano:/home/dcorbin# sh -x /etc/init.d/lvm start
+ modprobe lvm
+ modprobe lvm-mod
+ '[' -e /proc/lvm ']'
+ '[' -e /etc/lvmtab ']'
+ '[' -x /sbin/vgscan ']'
+ echo 'Setting up LVM Volume Groups...'
Setting up LVM Volume Groups...
+ /sbin/vgscan --verbose
+ /sbin/vgchange -a y --verbose

piano:/home/dcorbin# mount /data
mount: special device /dev/vg0/data does not exist

The reason you hear "panic" in my typing is the last line. :)
----
Fundamentally, I'm building a critical data file server.  LVM has caused 
me enough problems and delays, that I'm about ready to bypass it, saying 
it is putting my data at risk.  Feel free to convince me otherwise.

Thanks
David

Re: [linux-lvm] "umount" LVM stuff

[Heinz J . Mauelshagen]

Following this thread it kind of looks like you worked around
using LVM commands (i.e. removed a VG w/o using lvremove + vgremove).

If so, not a good idea :(

What does pvscan list ?
What does vgck say ?

On Mon, Feb 24, 2003 at 07:00:33AM -0500, David Corbin wrote:
> Goetz Bock wrote:
> 
> >On Mon, Feb 24 '03 at 02:15, Goetz Bock wrote:
> >  
> >
> >>>Attempts to access the logical volume I used to fail. 
> >>>      
> >>>
> >>You have disabled it, it's gone. 
> >>    
> >>
> >Don't panik :->
> >
> >your LVM will reappear, once you enable it again (vgchange -a y)
> >still, read some docs.
> >  
> >
> 
> I have read some docs.  I've spent hours combing the Net for the 
> answers, without success.
> 
> I *had* a working system.  But, I use the LVM commands so rarely, I can 
> never repeat what I did (notes or not).
> 
> piano:/home/dcorbin# sh -x /etc/init.d/lvm start
> + modprobe lvm
> + modprobe lvm-mod
> + '[' -e /proc/lvm ']'
> + '[' -e /etc/lvmtab ']'
> + '[' -x /sbin/vgscan ']'
> + echo 'Setting up LVM Volume Groups...'
> Setting up LVM Volume Groups...
> + /sbin/vgscan --verbose
> + /sbin/vgchange -a y --verbose
> 
> piano:/home/dcorbin# mount /data
> mount: special device /dev/vg0/data does not exist
> 
> The reason you hear "panic" in my typing is the last line. :)
> ----
> Fundamentally, I'm building a critical data file server.  LVM has caused 
> me enough problems and delays, that I'm about ready to bypass it, saying 
> it is putting my data at risk.  Feel free to convince me otherwise.
> 
> Thanks
> David
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] "umount" LVM stuff

[David Corbin]

Heinz J . Mauelshagen wrote:

>Following this thread it kind of looks like you worked around
>using LVM commands (i.e. removed a VG w/o using lvremove + vgremove).
>
>If so, not a good idea :(
>  
>
Well, not to my knowledge I didn't.   But my knowledge of LVM is very 
tiny.  All I remember doing was "vgchange -a n".

>What does pvscan list ?
>  
>
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE   PV "/dev/md0" of VG "vg0" [109.77 GB / 109.77 GB free]
pvscan -- total: 1 [109.78 GB] / in use: 1 [109.78 GB] / in no VG: 0 [0]

>What does vgck say ?
>
vgck -- VGDA of "vg0" in lvmtab is consistent
vgck -- VGDA of "vg0" on physical volume is consistent

>
>On Mon, Feb 24, 2003 at 07:00:33AM -0500, David Corbin wrote:
>  
>
>>Goetz Bock wrote:
>>
>>    
>>
>>>On Mon, Feb 24 '03 at 02:15, Goetz Bock wrote:
>>> 
>>>
>>>      
>>>
>>>>>Attempts to access the logical volume I used to fail. 
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>You have disabled it, it's gone. 
>>>>   
>>>>
>>>>        
>>>>
>>>Don't panik :->
>>>
>>>your LVM will reappear, once you enable it again (vgchange -a y)
>>>still, read some docs.
>>> 
>>>
>>>      
>>>
>>I have read some docs.  I've spent hours combing the Net for the 
>>answers, without success.
>>
>>I *had* a working system.  But, I use the LVM commands so rarely, I can 
>>never repeat what I did (notes or not).
>>
>>piano:/home/dcorbin# sh -x /etc/init.d/lvm start
>>+ modprobe lvm
>>+ modprobe lvm-mod
>>+ '[' -e /proc/lvm ']'
>>+ '[' -e /etc/lvmtab ']'
>>+ '[' -x /sbin/vgscan ']'
>>+ echo 'Setting up LVM Volume Groups...'
>>Setting up LVM Volume Groups...
>>+ /sbin/vgscan --verbose
>>+ /sbin/vgchange -a y --verbose
>>
>>piano:/home/dcorbin# mount /data
>>mount: special device /dev/vg0/data does not exist
>>
>>The reason you hear "panic" in my typing is the last line. :)
>>----
>>Fundamentally, I'm building a critical data file server.  LVM has caused 
>>me enough problems and delays, that I'm about ready to bypass it, saying 
>>it is putting my data at risk.  Feel free to convince me otherwise.
>>
>>Thanks
>>David
>>
>>
>>_______________________________________________
>>linux-lvm mailing list
>>linux-lvm@sistina.com
>>http://lists.sistina.com/mailman/listinfo/linux-lvm
>>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>>    
>>
>
>  
>

Re: [linux-lvm] "umount" LVM stuff

[Heinz J . Mauelshagen]

On Wed, Feb 26, 2003 at 06:38:54AM -0500, David Corbin wrote:
> Heinz J . Mauelshagen wrote:
> 
> >Following this thread it kind of looks like you worked around
> >using LVM commands (i.e. removed a VG w/o using lvremove + vgremove).
> >
> >If so, not a good idea :(
> >  
> >
> Well, not to my knowledge I didn't.   But my knowledge of LVM is very 
> tiny.  All I remember doing was "vgchange -a n".
> 
> >What does pvscan list ?
> >  
> >
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- ACTIVE   PV "/dev/md0" of VG "vg0" [109.77 GB / 109.77 GB free]
> pvscan -- total: 1 [109.78 GB] / in use: 1 [109.78 GB] / in no VG: 0 [0]
> 
> >What does vgck say ?
> >
> vgck -- VGDA of "vg0" in lvmtab is consistent
> vgck -- VGDA of "vg0" on physical volume is consistent

This all looks ok.

Doesn't "vgchange -a y" bring your VG back ?
If not so, try "vgscan ; vgchange -ay".

Regards,
Heinz    -- The LVM Guy --


> 
> >
> >On Mon, Feb 24, 2003 at 07:00:33AM -0500, David Corbin wrote:
> >  
> >
> >>Goetz Bock wrote:
> >>
> >>    
> >>
<SNIP>
> >>Fundamentally, I'm building a critical data file server.  LVM has caused 
> >>me enough problems and delays, that I'm about ready to bypass it, saying 
> >>it is putting my data at risk.  Feel free to convince me otherwise.
> >>
> >>Thanks
> >>David
> >>
> >>
> >>_______________________________________________
> >>linux-lvm mailing list
> >>linux-lvm@sistina.com
> >>http://lists.sistina.com/mailman/listinfo/linux-lvm
> >>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >>    
> >>
> >
> >  
> >
> 
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] "umount" LVM stuff

[David Corbin]

>
>
>This all looks ok.
>
>Doesn't "vgchange -a y" bring your VG back ?
>If not so, try "vgscan ; vgchange -ay".
>  
>
piano:/home/dcorbin# vgchange -ay
vgchange -- volume group "vg0" already active

So, it appears that the VG IS there.
----
 piano:/home/dcorbin# mount -t reiserfs /dev/vg0/data /data
mount: special device /dev/vg0/data does not exist

/dev/vg0/data is the device I used to use to mount it, and the error 
message is correct if I look at my filesystem (it doesn't exist).
----
piano:/home/dcorbin# mount -t reiserfs /dev/vg0/group  /data
mount: /dev/vg0/group is not a block device

I tried this command because /dev/vg0/group is the only device in /dev/vg0
----
Here are some other commands that I tried that may or may not tell you 
something...

piano:/home/dcorbin# 
lvscan                                                                                                                
lvscan -- no logical volumes found
piano:/home/dcorbin# ls -ltar /dev/vg0
total 28
crw-r-----    1 root     disk     109,   0 Feb 24 06:53 group
drwxr-xr-x   10 root     root        24576 Feb 24 06:53 ..
dr-xr-xr-x    2 root     root         4096 Feb 24 06:53 .

>Regards,
>Heinz    -- The LVM Guy --
>  
>

Re: [linux-lvm] "umount" LVM stuff

[Heinz J . Mauelshagen]

David,

try vgscan then which should bring your device node back.

Regards,
Heinz    -- The LVM Guy --


On Fri, Feb 28, 2003 at 07:48:05AM -0500, David Corbin wrote:
> >
> >
> >This all looks ok.
> >
> >Doesn't "vgchange -a y" bring your VG back ?
> >If not so, try "vgscan ; vgchange -ay".
> >  
> >
> piano:/home/dcorbin# vgchange -ay
> vgchange -- volume group "vg0" already active
> 
> So, it appears that the VG IS there.
> ----
>  piano:/home/dcorbin# mount -t reiserfs /dev/vg0/data /data
> mount: special device /dev/vg0/data does not exist
> 
> /dev/vg0/data is the device I used to use to mount it, and the error 
> message is correct if I look at my filesystem (it doesn't exist).
> ----
> piano:/home/dcorbin# mount -t reiserfs /dev/vg0/group  /data
> mount: /dev/vg0/group is not a block device
> 
> I tried this command because /dev/vg0/group is the only device in /dev/vg0
> ----
> Here are some other commands that I tried that may or may not tell you 
> something...
> 
> piano:/home/dcorbin# 
> lvscan                                                                                                                
> lvscan -- no logical volumes found
> piano:/home/dcorbin# ls -ltar /dev/vg0
> total 28
> crw-r-----    1 root     disk     109,   0 Feb 24 06:53 group
> drwxr-xr-x   10 root     root        24576 Feb 24 06:53 ..
> dr-xr-xr-x    2 root     root         4096 Feb 24 06:53 .
> 
> >Regards,
> >Heinz    -- The LVM Guy --
> >  
> >
> 
> 
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@Sistina.com                           +49 2626 141200
                                                       FAX 924446
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Re: [linux-lvm] "umount" LVM stuff

[David Corbin]

Heinz J . Mauelshagen wrote:

piano:/home/dcorbin# vgscan
vgscan -- reading all physical volumes (this may take a while...)
vgscan -- found active volume group "vg0"
vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
vgscan -- WARNING: This program does not do a VGDA backup of your volume 
group

But, ls -ltar /dev/vg0 is essentially the same. 

>David,
>
>try vgscan then which should bring your device node back.
>
>Regards,
>Heinz    -- The LVM Guy --
>
>
>On Fri, Feb 28, 2003 at 07:48:05AM -0500, David Corbin wrote:
>  
>
>>>This all looks ok.
>>>
>>>Doesn't "vgchange -a y" bring your VG back ?
>>>If not so, try "vgscan ; vgchange -ay".
>>> 
>>>
>>>      
>>>
>>piano:/home/dcorbin# vgchange -ay
>>vgchange -- volume group "vg0" already active
>>
>>So, it appears that the VG IS there.
>>----
>> piano:/home/dcorbin# mount -t reiserfs /dev/vg0/data /data
>>mount: special device /dev/vg0/data does not exist
>>
>>/dev/vg0/data is the device I used to use to mount it, and the error 
>>message is correct if I look at my filesystem (it doesn't exist).
>>----
>>piano:/home/dcorbin# mount -t reiserfs /dev/vg0/group  /data
>>mount: /dev/vg0/group is not a block device
>>
>>I tried this command because /dev/vg0/group is the only device in /dev/vg0
>>----
>>Here are some other commands that I tried that may or may not tell you 
>>something...
>>
>>piano:/home/dcorbin# 
>>lvscan                                                                                                                
>>lvscan -- no logical volumes found
>>piano:/home/dcorbin# ls -ltar /dev/vg0
>>total 28
>>crw-r-----    1 root     disk     109,   0 Feb 24 06:53 group
>>drwxr-xr-x   10 root     root        24576 Feb 24 06:53 ..
>>dr-xr-xr-x    2 root     root         4096 Feb 24 06:53 .
>>
>>    
>>
>>>Regards,
>>>Heinz    -- The LVM Guy --
>>> 
>>>
>>>      
>>>
>>
>>
>>_______________________________________________
>>linux-lvm mailing list
>>linux-lvm@sistina.com
>>http://lists.sistina.com/mailman/listinfo/linux-lvm
>>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>>    
>>
>
>*** Software bugs are stupid.
>    Nevertheless it needs not so stupid people to solve them ***
>
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
>Heinz Mauelshagen                                 Sistina Software Inc.
>Senior Consultant/Developer                       Am Sonnenhang 11
>                                                  56242 Marienrachdorf
>                                                  Germany
>Mauelshagen@Sistina.com                           +49 2626 141200
>                                                       FAX 924446
>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
>_______________________________________________
>linux-lvm mailing list
>linux-lvm@sistina.com
>http://lists.sistina.com/mailman/listinfo/linux-lvm
>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>  
>